I'm not sure but could it be better to dump Con and max out Res/Per to capitalize on deflection?
At least on patch 1.05, I tested the effects of INT on DoT skills like Envenomed Strike, and with an increase in INT, there's an increase in total damage output (for example, instead of saying 50 damage over 11 seconds, an increase in INT will change the skill to say something like 56 damage over 12.5 seconds, which means the skill has a base damage per second, and the more seconds the effect lasts, the more total damage). My understanding is also that DoT effects never stack with themselves, so this would mean that you wouldn't want to hit with a second Envenomed Strike until the first effect ended. Since this is how Deep Wound works as well (I assume... I haven't taken the skill on a Rogue yet and tinkered with INT to see how it adjusts the description), and with a base description of 10 damage over 10 seconds, INT only matters in terms of 1) how fast can you hit the same target repeatedly? and 2) do you intend to focus fire on one enemy at a time, or are you okay with switching targets?
Let's assume you're only concerned with hitting one target over and over again until they die. If your INT is minimal, leading to a 6.5 second Deep Wound duration, then as long as you can hit the same target again within 6.5 seconds, an increase in INT won't lead to an increase in damage. That is because you will keep refreshing the DoT so that the enemy is always taking an extra 1 DPS. But that's assuming you NEVER miss. Because you will miss sometimes, an increase in INT will likely work in your favor. Also, if you have a slower weapon or if you ever switch enemies, then an increase in INT will work in your favor.
TLDR: Higher INT on a rogue has no downside (except for the cost of another stat being lower). Whether or not the upside is worth it depends on how you build your rogue. If you take both crippling strike and blinding strike, envenomed strike and deep wounds, and possibly have some spellbound gear or a weapon that inflicts a status effect, then INT may be fairly useful.